Lamp base



FIG. 1 is a perspective view of a lamp base showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a perspective view showing a second embodiment of a lamp base showing my new design;

FIG. 8 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 9 is a right side elevational view thereof;

FIG. 10 is a left side elevational view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 shows a perspective view of a third embodiment of a lamp base showing my new design;

FIG. 14 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 15 is a right side elevational view thereof;

FIG. 16 is a left side elevational view thereof;

FIG. 17 is a top plan view thereof; and,

FIG. 18 is a bottom plan view thereof.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lamp base, as shown and described. 